Founded in 2160 by the human mercenaries Zaeed Massani and Vido Santiago, the Blue Suns were initially a Skyllian Verge protection racket. As they expanded in numbers and influence, the two co-founders disagreed vehemently on many issues. Finally, after arguing about whether to recruit the slave-trading batarians into their ranks, Vido ambushed Zaeed and shot him in the head.
Believing Zaeed dead, Vido took full control of the Blue Suns and hired whatever batarians he pleased. Soon, he had crowned one named Solem Dal'serah as titular head of operations. It was a move designed to placate his batarian investors and draw fire from would-be assassins. It worked on both counts, and the partnership has lasted to this day.
Over the decades, the Suns grew into a fearsome combat force spanning dozens of planets in Citadel space, the Verge, and the Terminus Systems. Knowing that a good logistical team is key to fielding an army, Vido diversified the Suns, selling arms, training, and supplies as often as taking contracts to crack skulls. Even when the Suns suffered heavy losses, Vido's entrepreneurial expertise ensured new recruits could replace the old. All that was lost was the truth - today, only a handful of trusted mercs even know who Vido Santiago is, let alone his old partner Zaeed.